Do-it-yourself disc grinder. How to make a belt grinder for metal with your own hands? Homemade grinding machine drawing

I made a site about homemade products myself. On our website you will find homemade products, clear instructions will help you to assemble and use the homemade product you have chosen without any problems at home or at work.

The large drum turns the machine into a kind of grinding planer device.

Homemade wood sander with sanding drum large diameter allows you to process workpieces thinner than 3 mm. In this machine, in comparison with a wide-belt machine, a labor-intensive tape guide mechanism is not required in the manufacture.

Sanding drum manufacturing procedure

The grinding drum of the machine is glued from separately sawn and milled discs. The skin is fastened and stretched with a special clamp. To change the thickness of the wood being removed, the machine table moves relative to the drum. The back of the desktop is hinged and the front rests on a threaded stud for adjustment. The workpiece is supported and guided by a feed table that slides along the work table. The feeding table moves manually, so a special power-driven feeder is not needed, and this greatly simplifies the design,

How to make a wood grinder body with your own hands

The body is assembled from nine main steels: two side and rear panels of the front brace and two linings, a dowel-brace at the front rib and two reinforcement disks. All parts are sawn to the dimensions shown in fig. one.

Since the desktop must be strong enough and not bend when pressed against the drum, we made it from two sheets of chipboard glued and screwed together. In addition, on the feed side, the work table was reinforced with a thick hardwood crossbar, which at the same time creates a supporting surface for the adjusting pin.

A feed table walks along the work table, directly supporting and guiding the workpiece during calibration. It is made of 20 mm chipboard and 38 mm narrower than the work table and this length. The table serves to support the workpiece after the passage of the drum. In order for the feed table to move along the desktop without skew, a groove 6 mm deep and 20 mm wide was selected in the middle of its lower side, and a 5 mm thick guide bar was attached to the desktop.

Two slats at the ends of the drop table hold it on top of the long work table. To ensure the smooth movement of the table, a thin veneer pad is inserted between the slats and the desktop, providing a small gap. To prevent the workpiece from slipping back during grinding, a 5mm hardwood stop bar is inserted into the 3mm slot in the table (Fig. 1).

The desktop is attached to the back of the case with two hinges. The crossbar on the worktable must align with the adjusting pin. The drum is made from chipboard. Its width is 460 mm, Ø400 mm, which provides an extensive grinding area. The drum is assembled from 24 discs, roughly sawn individually, and then glued and fastened with screws (Fig. 2). The drum is balanced after installing the skin clamp.

To reduce the weight of the drum, most of all discs are sawn in the form of rings with a width of 50 mm. Two outer discs and one in the middle are solid and have holes drilled for a steel axle Ø20 mm. The drum is pasted over with dense rubber 1.5 mm thick. It serves as a substrate for the skin and provides it with a better fit to the part.

Fastening sander skins on wood

To facilitate insertion and removal of the skin, we have developed a simple lever-spring clip.fig. 3).

Installing the drum sander

The drum rotates on a Ø20 mm axle (you can use a Ø16 mm axle) supported by four caged bearings bolted to the side panels of the machine. Holes for them, to make it easier to align the drum, are drilled with a diameter slightly larger than the diameters of the bolts.

As a drive, we chose a single-phase motor 1750 rpm. The base of the motor is attached directly to the rear panel, and the switch is attached to one of the pads on the front of the machine. A pulley 2 * 75 mm was put on the motor shaft, the driving and driven pulleys were inserted into the same plane and fixed.

V. Laskin, D. Ren. Canada
According to the magazine SAM

homemade-universal

Universal table

Bench Planers - Design and Assembly

DIY woodworking machine - drawings

traditional desk

Chapter: Various homemade Publication date: 2-03-2012, 03:58

Belt sanders for wood are a technique that is used at the final stages of the production of parts and structures made of wood and wood-based materials. The equipment is used for finishing machining of the workpiece.

Since the need for such exists in a variety of industries, wood sanding machines have become widespread.

Such units are of particular value for manufacturers of furniture and other consumer goods made of wood. Modern grinders are able to process various types of wood, which indicates their versatility and multifunctionality.

What is the main purpose of such equipment?

The key purpose of the use of grinding machines is the final leveling of the wooden surface, the elimination of irregularities and roughness, the creation of smooth, even surfaces, the removal of minor mechanical defects, varnish deposits, and burrs.

Also, belt grinders are often used when processing roundings, as well as for internal grinding of workpiece elements.

The basic areas of application of these machines, depending on the type of feed and processing, are as follows:

• Processing of curved surfaces, providing free movement tapes;
• Grinding of flat parts on a fixed table, as well as with manual or mechanized movement of the working surface;
• Grinding bar and panel elements;
• Treatment paintwork details.

To understand what a belt sander for wood is, it makes sense to study their design in more detail.

Let's consider this issue in more detail below.

Structural features of the grinder

Today, belt grinders are produced by both domestic and foreign companies. The range and variety of this type of equipment is quite wide, as well as the prices for it. Models vary depending on performance and other parameters.

How to make a belt sander with your own hands?

Their designs also differ, but, nevertheless, there is something that unites them and makes them similar to each other. We are talking about the main processing tool - an abrasive belt.

In the predominant majority of models of wood grinding machines, it is a closed ring of the processing blade, which is fixed between two rotating drums, one of which plays the role of a leading element connected to the power unit.

The driving drum, as a rule, is equipped with a mechanical transmission, the basic element of which is a belt drive. It is on it that the torque is supplied from the electric motor.

At the same time, the design of the belt sander for wood provides for the possibility of choosing the intensity of rotation of the driving drum, which allows you to select the most appropriate format for processing a particular workpiece.

Depending on the design features of a particular machine model, the abrasive belt can be located in a horizontal or vertical position.

There are also special modifications of the units, the design of which provides for the location of the tape at a certain angle. The tape is installed on the frame, where the workpiece is polished.

In simplified devices, the workpiece is held by the master manually. However, this format of grinding is becoming more and more obsolete, as it is not safe enough and unproductive. Models in which the workpiece is fixed by means of special accessories are characterized by increased productivity and processing efficiency.

The desktop of a wood grinder is one of the key design elements.

It is usually made from wood or metal. In the second case, the unit will be convenient when working with more complex shapes. An important parameter of the table is its size.

It is on the dimensions of the working surface that it will depend on how large parts the master can process using the machine. An experienced specialist knows that if the part is longer than the desktop, it will not be easy to process it. Of course, this inconvenience will affect the quality final product and the run time will be longer.

Today, manufacturers of wood belt sanders offer two main types of devices - with a fixed and movable work surface, as well as machines with a movable abrasive belt.

In all this diversity, a separate group of units stands out - wide-belt machines, in which the table combines the functions of a working surface and a feeder. Machines equipped with a table have a horizontal belt, while machines with a free abrasive belt can provide any angle of inclination.

It is no secret that during the grinding of a wooden workpiece a large amount of chips are formed.

So that it does not interfere with the master to do his work, domestic and foreign equipment manufacturers equip machine tools with special high-performance hoods, which remove most of the waste during operation.

As for power units for grinders, here most manufacturers are limited to electric motors with a rated power in the range of 2.5-2.8 kW.

The average belt speed when installing such a motor is about 20 meters per second.

conclusions

Today, belt grinders are produced in large numbers all over the world. European and, in particular, German companies are considered leaders in terms of the quality of structures and the intensity of innovation in them. Among the flagships, it is worth highlighting such brands as Fein, Loeser, WAHLEN, SALTEC, NIEDERBERGER, BM.

If you are looking for more affordable equipment, then you should pay attention to domestic achievements in this area.

Worthy in terms of price and quality units are supplied to the CIS market by the Lipetsk Machine Tool Plant. The equipment produced by MS-GROUP and LLC NEVASTANKOMASH is also in demand. A compromise choice between expensive German cars and domestic units lagging behind in a number of parameters can be Czech products. trademark PROMA.

Obviously, for the master, the search suitable equipment won't be difficult.

You just need to decide how much you are willing to spend on equipment and what exactly you expect from it.

Assembling a homemade grinder

Process features

A homemade grinder is not such a rarity; it is quite possible to assemble it with your own hands.

The grinder is indispensable for finishing wood parts.

A grinder is a necessary thing and will always come in handy in the household.

If you come across spare parts in large quantities, besides, there is free time and a desire to try yourself as a design engineer, then a home-made grinder in your hands will turn out to be suitable for work.

So, you will need:

• motor (its role can be played by any other motor taken from any electrical device);
• electric drive (for these purposes, the most ordinary battery from a computer Ups is suitable);
• screws;
• wires;
• switch;
• board;
• sandpaper;
• glue;

Stages of assembly and installation

Grinding machine diagram

After you have all the necessary tools at your disposal, you can begin to make a grinding unit.

To start on wooden board, pre-treated with varnish, you need to attach the motor. Finding it is easy, many people at home will probably have an old non-working hard drive from a computer. Having disassembled it, removed the top cover and removed the head block, you will get the perfect workpiece - a motor. If you want your grinder to have more power, then it makes more sense to use a more powerful motor.

For example, from a fan. And if you have plans to manufacture a serious stationary grinder, then in this case you need to take an electric motor from an unnecessary washing machine. Then, in addition to the function of grinding, she can also act as a grinder.

The next step will be the installation of the drive.

Sanding machines for wood: belt, disc, drum

In order for the motor to work, you need to provide it with an uninterrupted power supply. If your grinder has a small motor, then the power supply to it must be done in a special way. For example, through a battery.

After the main components of the homemade product are firmly fixed on the board, they will need to be connected to each other. This operation can be performed using ordinary wires. Do not forget about the switch, be sure to introduce it into the overall circuit.

If you install a felt nozzle on the grinder, you get a polishing machine.

Now you need to make a grinding wheel with your own hands.

To do this, take sandpaper and cut out two circles of a suitable diameter. Then glue them together. You have a finished grinding wheel, made by yourself. Of course, you can buy a ready-made circle in any specialty store.

By the way, they also sell circles of small sizes.

Next, we proceed to attach the circle to the motor using two simple bushings. At the time of attachment, be guided by the diameter of the axis of the motor, as there is a possibility of a diameter mismatch. In this case, you can simply pick up plastic bushings according to the axle diameter.

As you can see, the process of making a grinder with your own hands is quite simple and does not require much effort and cost.

After all, it can be made from improvised materials. With the help of such a machine, you can easily grind various metal or wooden parts.

Do-it-yourself wood sanding machine video drawings

There is a huge amount of grinding equipment that makes any wood surfaces very smooth.

It is a frame on which a special frame with an electric motor is located (motors of washing machines are used for homemade products) and a mechanism. The mechanism itself, in turn, includes shafts, pulleys and an abrasive belt.

Application area

They are used in all industries where wood is processed.

Often, any draft products have an uneven and rough surface. Such blanks cannot simply be painted and put up for sale or installed anywhere.

Belt sander

These shafts are driven by an asynchronous electric motor. The abrasive belt does not sag during wood processing, but rests against the working plane, which has a low coefficient of friction. The tape can be placed both horizontally and vertically.

The advantage of this equipment is the processing of long workpieces.

Disc grinder

The working area of ​​this equipment is an abrasive wheel.

per axle electric motor a circle with Velcro is fixed, on which the abrasive is fixed. After starting the motor, the abrasive wheel rotates around its axis, thereby carrying out grinding. This type of machine has the ability to adjust the processing speed, and the number of revolutions of the axis will not decrease.

grinders . And that's not all, so as not to spend money on machines, people came up with grinders from a drill, from Bulgarian.

The fact is that nozzles are fixed on these tools and the same grinding is carried out.

Motor power calculation

Important! Before creating any homemade brainchild that performs grinding functions, it is extremely important to correctly calculate the power electric drive.

After all, if the motor power is weak or vice versa strong, then you cannot do any work.

P=qS(K+k)U/1000n

Blueprints a photo scheme. As an example for visual study, consider a belt sander.

Grinding machine drawing

The other side of the bed is designed to accommodate the shaft, with a pulley for a belt and rollers for an abrasive belt. The tape itself is installed with a slight slope.

This is done so that the abrasive smoothly and gently comes into contact with the machined plane of the workpiece.

Tip: Before installing the abrasive strip on the rollers, it is necessary to wrap a thin strip of rubber around them. This will reduce strip slip during operation.

1. Wood board.
2. Ball bearings.
3. Electric motor.
4. Rubber strap.
5. Rubber belt.
6. Metal pulley.
7. Self-tapping screws, fasteners.
8. abrasive element.

After we have decided on the materials and working tools, we can begin to assemble all the parts and elements into one mechanism. For this, the frame is assembled. It can be metal (consist of a metal-profile pipe) or wood (consist of wooden bars and solid wood).

When the frame is ready

You can start installing the motor. The motor power must be at least 2.5 kW and not more than 3 kW, with the engine speed between 1200 and 1500 rpm. A pulley for a belt is installed on the motor shaft. The motor is mounted on one side of the frame.

Grinding machine - all its varieties

Motors are often used from washing machines used at home.

On the other hand

A shaft with bearings is located, on one side of which a pulley is fixed, and on the other side a roller, an abrasive belt will be put on it in the future. Shaft pulley and motor pulley must be in a flat horizontal plane. The belt tensioner should be located in the same area.

Coming from wood

After

Once everything is done, you can make the first start and configure the equipment properly. When the setting is done, the first workpiece is run and the result of the work is checked.

If everything worked out, it means that you did everything right.

download video instructions.

Video reviews

Belt sander for wood and metal
Do-it-yourself drum sander for wood
DIY wood grinder: drawings
DIY - plywood sander.

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How to make a grinder with your own hands: instructions with step by step photos

Nowadays, there are no surfaces that are not smooth.

Smoothness is achieved through various grinding devices. Professional equipment costs big money and not everyone will be able to purchase it, besides, such machines have a fairly high weight and dimensions.

Fortunately, the skilful hands of our country have adapted to produce analogues of equipment for such a modest budget. The grinding machine also did not stand aside and was subjected to a modernization of manual craftsmanship. It is with this homemade machine that we will continue to get acquainted.

There is a huge amount of sanding equipment that makes any wood surface very smooth. It is a frame on which a special frame with an electric motor is located (motors of washing machines are used for homemade products) and a mechanism. The mechanism itself, in turn, includes shafts, pulleys and an abrasive belt.

Application area

They are used in all industries where wood is processed. Often, any draft products have an uneven and rough surface. Such blanks cannot simply be painted and put up for sale or installed anywhere.

Sander selection guide

Therefore, for further processing wood, all its surfaces can be sanded.

Grinding machines are also used for processing sags and chamfering, rounding corners. In addition, the grinding tool gives any surface smooth alignment and calibration.

Types of wood sanding machine

Depending on the surface to be treated, the following types of grinders are distinguished:

Belt sander

Belt sander

This equipment uses an abrasive belt, which is pulled by two shafts.

These shafts are driven by an asynchronous electric motor. The abrasive belt does not sag during wood processing, but rests against the working plane, which has a low coefficient of friction. The tape can be placed both horizontally and vertically. The advantage of this equipment is the processing of long workpieces.

Universal grinding unit

Universal grinder

In this case, the machine has two working grinding surfaces.

One is tape surface and the other is circular (disk). This universal machine was created for the convenience of working on it. By the way, such equipment will significantly save the budget. In such a device, only one engine is used.

Based on this, when working on two working surfaces, the load on the motor will not increase much.

Drum grinding tool

Drum grinder

In this case, the abrasive tape is wound on two rollers in a spiral manner.

Under the rollers is a tabletop with a smooth surface. The gap between the tabletop and the rollers is adjustable to the required distance. With the help of such a machine, it is possible to calibrate the surface of a wood blank.

Disc grinding tool

Disc grinder

The working area of ​​this equipment is an abrasive wheel. A circle with Velcro is attached to the axis of the electric motor, on which the abrasive is attached.

After starting the motor, the abrasive wheel rotates around its axis, thereby carrying out grinding. This type of machine has the ability to adjust the processing speed, and the number of revolutions of the axis will not decrease.

On each of four types machines can perform certain operations. Now that we have an idea of ​​what the grinding equipment looks like, it's time to disassemble the design of the machine.

In addition to the above machines, there are also portable ones. grinders.

And that's not all, so as not to spend money on machines, people came up with grinders from a drill, from Bulgarian. The fact is that nozzles are fixed on these tools and the same grinding is carried out.

Tip: If you still decide to purchase a factory grinder, then decide in advance on the work and loads that your machine will undergo, and only then make a purchase.

The same applies to homemade tools.

Motor power calculation

Important! Before creating any homemade brainchild that performs grinding functions, it is extremely important to correctly calculate the power of the electric drive. After all, if the motor power is weak or vice versa strong, then you cannot do any work.

The calculation of power is carried out according to a special formula, which belongs to the category of complex mathematical calculations.

The formula looks like this

P=qS(K+k)U/1000n

Where each designation means the following

1. q - Indicates the pressure of the processed wood part on the plane of the abrasive cloth (N / square centimeter).
2. k - The index of friction of the wrong side of the abrasive on the working surface.
3. n - Efficiency of the entire system.
4. K - The indicator of the working plane of the abrasive relative to the workpiece. The priority is the density of the tree and its graininess. The limits of this indicator range from 0.2 to 0.6.
5. S - The area of ​​the workpiece that is in contact with the abrasive, measured in square centimeters.
6. U - The speed of rotation of the abrasive, measured in meters per second.

When you calculate the required power of the electric drive of your future unit using the formula, you can safely begin to assemble the machine as a whole.

It's time to get acquainted with the design of a homemade machine. Blueprints all four types of equipment can be found in free access for viewing and download, as well as download all kinds of a photo scheme.

As an example for visual study, consider a belt sander.

Grinding machine drawing

The design of the machine and its schemes

Any assembly of home-made equipment begins with the construction of a frame or foundation for future machine equipment.

This can be done with a metal material, or with a wood material. The following dimensions of the frame are used as standard 500 mm x 180 mm, while the thickness should be 2 cm.

After making the base, you can proceed to the next steps. An asynchronous motor can be installed in several places so that its operation is complete. Prepare a plane on the bed itself or make a platform for the motor, which will be attached to the end of the bed.

The other side of the bed is designed to accommodate the shaft, with a pulley for a belt and rollers for an abrasive belt. The tape itself is installed with a slight slope. This is done so that the abrasive smoothly and gently comes into contact with the machined plane of the workpiece.

Diagram of a belt sander

Tip: Before installing the abrasive strip on the rollers, it is necessary to wrap a thin strip of rubber around them.

This will reduce strip slip during operation.

As we can see from the diagram and drawing, the design of the grinding equipment is quite simple. All varieties of these machines are assembled according to the same scheme.

Tip: In the process of assembling your future grinding unit, you must comply with all the necessary dimensions, and you must also calculate all the parameters very seriously.

When the design is familiar to us, we can proceed to the assembly process.

The assembly process of the grinding machine

To assemble the grinding tool, you will need the following items:

1. Wood board.
2. Wooden bars or metal profile pipe.
3. Ball bearings.
4. Electric motor.
5. Rubber strap.
6. Rubber belt.
7. Metal pulley.
8. Self-tapping screws, fasteners.
9. abrasive element.
10. Working tool (drill, grinder, screwdriver, jigsaw, etc.).
11. Welding machine (if the frame structure consists entirely of metal).

After we have decided on the materials and working tools, we can begin to assemble all the parts and elements into one mechanism. For this, the frame is assembled.

It can be metal (consist of a metal-profile pipe) or wood (consist of wooden bars and solid wood).

When the frame is ready

You can start installing the motor. The motor power must be at least 2.5 kW and not more than 3 kW, with the engine speed between 1200 and 1500 rpm.

A pulley for a belt is installed on the motor shaft. The motor is mounted on one side of the frame. Motors are often used from washing machines used at home.

On the other hand

A shaft with bearings is located, on one side of which a pulley is fixed, and on the other side a roller, an abrasive belt will be put on it in the future.

Shaft pulley and motor pulley must be in a flat horizontal plane. The belt tensioner should be located in the same area.

Coming from wood

Either a stand is constructed from plywood or metal, on which the remaining rollers will be placed and an emery tape is worn. There must also be a tension mechanism. In addition, the presence of a working bar is mandatory, on which the abrasive belt will rub.

On the frame, as a rule, from the end, a start button is installed.

The electrical circuit of the machine must be grounded.

After

Once everything is done, you can make the first start and configure the equipment properly. When the setting is done, the first workpiece is run and the result of the work is checked. If everything worked out, it means that you did everything right.

For visual clarity and a complete understanding of the entire assembly process, you can download video instructions.

General feedback and summing up

As a rule, on the Internet about this type of equipment only positive reviews. Indeed, when in everyday life it is necessary to give this or that wooden thing a smooth surface, then the presence of grinding tools is indispensable.

Video reviews

Video review of a homemade grinding machine:

Video review on the choice of grinding equipment:

Video review of the belt sander:

Video review of eccentric sanders:

DIY grinding machine: drawings, photos and videos
Do-it-yourself belt sander - Easy business
How to make a grinder with your own hands: instructions, description Cheap DIY grinder
Do-it-yourself wood sanding machine video drawings
DIY grinding machine Video on the Zaporozhye portal
Belt sander: we study and do it ourselves
How to make a grinder with your own hands Our hands How to assemble a grinder for wood with your own hands
GRINDING MACHINE OWN HANDS Video!

- t-Video surfing

Wood grinder: grades and performance. Angle, vibration, grinding and drilling machines

Grinding wheels for wood

The size of the discs may vary depending on the size and "Bulgarian". They are available as wood grinding wheels with a diameter of 115, 125, 150, 180 and 230 mm.

Advice. Never use wooden plates designed for metals.

They have a completely different structure, and such measures will not only give the desired result, but can lead to injury.

• Favorable price, especially for models with small wheels, the performance of which is sufficient for working with wood.
• Comfort walls of a cylindrical beam.

Grinding rounded surfaces

Advice. When sanding, use personal protection because wood dust can damage the respiratory tract and mucous membranes.

But here, for leveling flat horizontal surfaces, "Bulgarian" is not very convenient due to the asymmetry of its structure.

drilling

Drill with grinding head

Such a tool is very unusual to use in the field, but can still be well controlled in small quantities.

For them, rubber-based special circles are used with a rectangular pin fixed in the rod. That being said, do it by shooting and fixing it.

• Cheap and easy to use.
• extended. In almost every home you can find exercises.
• Convenient processing of hard-to-reach cities.

Large areas of the same varnish for household appliances will be very problematic.

Vibratory Sander

Manual Vibratory Sander for Wood

This version of the equipment is much more suitable for processing smooth surfaces.

The electric motor drives the working part of the device through the transitional eccentric, so that its translational movements are performed from one side to the other, which perform grinding.

You can choose sanding paper of any grit size, cut it and fix it with a specially protected fastening system.

A characteristic disadvantage is that, due to the small amplitude of the brush strokes, the removal of thick layers of wood is very stressful.

explosive machine

Hand sander for wooden belts

It is the most efficient tool for high quality finishing of wooden floors and vertical structures, even wooden structures.

The working principle is similar to that of a desktop computer and a stronger representative of abrasive equipment, and includes the following:

• Two rollers have a round band of sandpaper.

Spare belts for belt sanders

• When the motor is turned on, the drive cylinder starts to rotate so that the cushion movement is performed.
• Bring to the selected surface and grind.

bottom grinding

The advantages of such equipment:

• Simplicity and practicality of work.
• High performance.
• The cost of consumables.
• The presence of a special bag for collecting wood dust.

Wood dust bag device

• Possibility of use as stationary equipment.

  To do this, the tool is mounted on a platform with a special frame or clamp.

Portable wood chipper

Stationary equipment

If you need to polish a lot of small parts, instead of a massive aircraft, it is more rational and convenient to use a stationary wooden coffee grinder firmly fixed on a flat surface and has great potential.

DIY wood grinder

Many of them are mainly used in the woodworking industry.

Let's look at some of them:

1. Tape machine. The basic principle of operation of such devices is similar to their small masters.

   This means that there are also two rollers, one of which is powered by an electric motor and has an abrasive belt mounted on them. But let's take a closer look at the structure of such equipment:

Narrow Band Machine with Fixed Mill

LBSM 2505 ESE for wood polishing

1. Drum machine.

   In this case, the abrasive material is not distributed between two pulleys, but is wound on one drum. The main difference of such equipment is the ability to remove the most accurate layer of wood, which is very important when processing parts of different models.

Drum type grinding and grading machine

home car

We should also think about how to make a homemade milling machine:

1. We take an electric motor from an old washing machine.

Sample of a suitable electric motor

1. Prepare a metal rod with a cross section of 2 cm, a diameter of 10 cm of PVC, a plate, screws, rubber and glue, and then assemble the drum:
   • A section of a pipe section that is slightly worse than the selected strip.
   • Two plates with a diameter of 10 cm were cut into a plate and 2 cm holes were drilled in them.
   • We insert corks into the tube and insert rods into it.

     All joints are impregnated with glue.

   • From the top adhesive tube with rubber, which in the future will serve as a suitable substrate for the recording tape.

1. The bag and desktop are pulled out of a thick, durable board. Please note that all connections are securely attached and that the entire structure is stable. To ensure that the workpiece moves relative to the drum, secure it with a key loop and tighten the screw for the screws provided by the power supply.
2. We collect all the elements in one piece, we supply the wiring and the switch.

Easy to Install Self Leveling Wood Sanding Machine

conclusion

The tree can work with manual and stationary equipment.

The first group includes tools that can be found in the workshop of any guardian: a drill, a "bulgarian", a vibrating and sanding belt for wood. They are very suitable for polishing floors, walls and other large structures.

If you need to accurately remove wood from certain parts, then you will need one of the above machines. in this article you will find additional materials. Make your choice according to the situation.

Job for wood grinder

All materials in any production, in addition to manufacturing, require additional and finishing processing. Vivid examples of such treatments are grinding and polishing of the product. These two types of mechanical action on the surface of the part, bring it appearance to perfection. However, everyone knows that in order to perform these operations by hand, it will take a lot of time and effort, and the uniformity of processing can only be ensured by very experienced master. To facilitate this kind of work, a person came up with various devices and mechanisms to help himself. Some of them will be discussed further.

General purpose and types of machines

The machine is intended for the final processing of parts and workpieces made of different materials by exposing them to a surface with an abrasive or diamond coating. The machine, its components and mechanisms allow t observe the accuracy of size and shape, and also ensure the creation of an ideal surface of a part or workpiece.

With the help of the machine, you can process flat parts, surfaces outside and inside, parts of various geometric shapes, grind or polish threads and gear teeth. By their own characteristics grinding machines are divided into:

• Cylindrical grinding.
• Internal grinding.
• Centerless grinding.
• Surface grinding.
• Special machines (for grinding threads, gears).

Grinding process

Grinding is the process of removing the top layer from the surface of the workpiece using abrasives or diamond grit. They are assembled into a common mass on the working surface and fastened with a binder. They eventually form a grinding wheel or belt..

During operation, the abrasive surface is given Roundabout Circulation using an electric motor. When the surface of the workpiece comes into contact with the abrasive, the machining process takes place. There is a common belief that grinding with abrasives is friction processing. However, this is not true.

Each abrasive particle has sharp edges, when touched with a material (metal, plastic, wood, stone) it works like cutting tool and removes chips, like a milling cutter or drill. Given the considerable speed of rotation of the grinding wheels, as well as the occurrence of chips as a grinding product, it is necessary to take into account the possibility of injury by this very chip.

Safety measures during work

When working on the machine, observe following rules safety precautions:

Necessity at work and at home

Today, in production shops, grinding machines are used all the time. Depending on the scale of production, both one machine and all its varieties in terms of complexity and dimensions can be installed.

However, in everyday life this equipment there is always an application. Some - in the garage there is a bench sander for metal processing. Others have several wood sanders of different design installed in their workshop. The third - in possession is a universal, combined machine. There are power tools for manual grinding: drum type, belt sander, band saw, small machines or large machines. And they are all in demand.

There are quite a few on the market wide range all kinds of similar equipment from many manufacturers. And their prices are quite reasonable. But these are general purpose machines. And if a person does own business , or he has a hobby, then a machine of special specialization is needed. Here the price is already rising several times.

For this reason, or based on their own desires, many craftsmen make homemade products. Mainly for processing wood, plastic and metal, less often for cutting and grinding stone. And, in general, this is correct. After all, even simple sharpening kitchen knives easier and faster to do on the machine than by hand using a touchstone. The benefit of creating a home-made machine for wood with your own hands is also its very simple design.

DIY grinding machine for a tree, it is not difficult to assemble. In the people it is also called simply - emery.

The main component is the engine. Surely many of the household there is an old washing machine. Its motor is quite suitable for this purpose. If not, a new engine on the market will be quite expensive, but at any flea market you can find a used one in working order. The electric motor must be strong from 750 W to 2 kW, not high-speed from 1500 to 3000 rpm, if it is three-phase, then it can always be adapted to 220 V. You will also need thick plywood, self-tapping screws, PVA glue, and a tool, of course.

The task is simple: make a hard disk that sandpaper sticks to. To do this, we draw a circle with a diameter of 150-170 mm on plywood, if the plywood is thick enough to hide the clamping nut, one blank is enough. If not, we glue two identical blanks with PVA glue. The clamping nut of the motor spindle must be recessed into the disk flush with its working plane.

From the same plywood 15-24 mm, you need to make several parts:

• The frame to which the engine will be attached.
• Feed table with guides for changing the angle of inclination.
• The design of disk protection.
• Base for attaching the entire machine to the workbench.

Protection for the disk can be made in the form of an arch with right angles or truncated. She, like the feed table, is attached to the frame. Of the additional devices, you can install an emphasis-protractor on the feed table, which will allow you to feed the workpiece at a fixed, horizontal angle.

Paying tribute to aesthetics, it is desirable to grind every detail before assembly. But this is optional, but with the serving table this must be done carefully. The smooth surface will provide uniform and continuous movement of the part along the working surface of the disk.

The purpose of this machine is revealed in its very name.- surface grinding, that is, for grinding flat surfaces of parts and workpieces. It can be disk, drum (like a thickness gauge) or tape. At the same time, its working surface can be located vertically, horizontally or regulated.

Individual machine designs are made fully adjustable. But this is individual. Homemade cars Everyone does it for themselves, so that it is more convenient to work. Fully adjustable designs are more difficult to manufacture. They have an adjustable pressure of the drum or tape, that is, in other words, there is the possibility of a fixed movement of the working surface along the vertical axis. And the handpiece has a two-way movement mechanism, like the cutter holder carriage on lathe.

From the verbal description it is difficult to imagine what it looks like. And even more difficult to understand how it works. But today we have the Internet. There you can find videos where experienced craftsmen share their experience, explain in detail and show how to make such equipment. Detailed drawings and diagrams with exact dimensions and instructions on what material to use for assembly. In general, if there are difficulties with self-design, then you can always just make someone else's copy.

This machine was designed to process long parts. The abrasive belt is based on a durable cloth fabric fastened into a ring. There are different sizes. It is driven by the same electric motor with similar characteristics. But some craftsmen replace the engine with a drill. A good drill is a versatile tool in many ways. However, such a replacement is more relevant for the small size of desktop machines, as a rule, modelers use them.

How is a belt sander assembled with your own hands? The tape is stretched between two shafts or drum rollers. One of which is the master (it is attached to the motor spindle), and the second is the slave (it provides tension to the sanding belt). To prevent the tape from jumping off the drums, washers-stoppers are attached to their ends. It turns out something like a textile coil. With slight distortions, the wear of the belt occurs faster than the edges of the belt rubbing against the lock washers are destroyed. So this idea is quite viable and justifies itself.

Also, between the drums on the back side of the belt, a support screen is installed, which ensures tight pressing of the entire plane of the workpiece to the surface of the belt. To reduce the friction force, the screen is carefully polished. It can be made from both light metal and hard wood.

The drive roller must be rubberized or made of hard rubber. This will ensure that the tape does not slip on the surface of the roller. The entire structure, if necessary, can be positioned in different ways: vertically, horizontally or at an angle. To a common frame, as on all similar machines, a rigid handrest is attached, at an angle of 90 degrees, or adjustable. The distance between the tape and the edge of the hand table should not be more than 3 mm. Due to the fact that the rupture of the tape is not capable of causing significant bodily harm, protection is made only to remove grinding products.

Homemade grinder

A grinder is a high speed belt grinder or general purpose machine. Working surfaces - a disk and a tape. The engine used is the same as on all machines. And high speed is achieved by using pulleys of different diameters. A large diameter pulley is mounted on the motor spindle and is the driving one. Small pulley - tension.

On the universal machine a disk is also attached to the spindle. You can also install an additional transfer roller, the support mounts of which will be spring-loaded. This is done to quickly change the abrasive belt.

The grinder differs from other grinders in processing speed and versatility. Using interchangeable belts for different materials, even high-alloy steel surfaces can be quickly processed.

In the process of grinding, the surface of wood or metal is brought to the desired degree of smoothness. The use of special mechanisms allows you to complete the work faster and better. And by making a grinding machine with your own hands, you can save a lot of money.

Types of grinding machines

Grinding is the final stage of workpiece processing before applying a protective coating. The process is carried out using grinding tools and emery materials. All machines are divided into:

• surface grinding;
• circular grinding;
• internal grinding;
• specialized.

The equipment is designed to perform:

• stripping and cutting blanks;
• finishing to the final size of gears, planes, torsion surfaces;
• sharpening knives, drills, cutters.

Most often, craftsmen try to make drum and tape-type woodworking machines on their own.

Features of drum sander

The working body of the drum machine is a grinding disk in the form of a drum. As a rule, long and flat wood parts are processed on it, including shields, slats, boards.

• base;
• engine;
• grinding cylinder;
• a device for changing the speed of the feed cylinder;
• working surface;
• feed cylinder;
• protective box;
• dust extractor;
• device for adjusting the height of the working body.

The device of the machine is not difficult, so you can make it yourself in your home workshop.

Selection of parts

The electric motor can be taken from a broken washing machine, a belt, pulleys and electrical elements are also suitable from it. The optimal power of the electric motor is 250 - 300 W at 1.5 - 3 thousand revolutions, single-phase (to make it easier to connect) and asynchronous, it is more productive.

The drum is made from bars in the form of a cylinder, rings made of wood, a cardboard tube or a piece of plastic sewer pipe. The last option is the easiest, so more about it. The drum is put on an axis made of a metal rod up to 20 cm long.

1. We cut off a segment from the PVC water pipe equal to the future length of the drum, it should be slightly shorter than the axis-rod.
2. From a board or plywood we cut out a pair of end caps equal to the cross section of the pipe, we make holes for the axis in the centers.
3. We fix the plugs with screws at the ends of the pipe (we drown the heads).
4. We install the axis-rod, fix it with glue.
5. We glue sheet rubber on the surface of the pipe, which will improve the fit of the workpiece. Abrasive material can be attached to the drum with a stapler, in a spiral.

The body of a homemade machine is made of thick plywood or wood boards. You can also make a work surface out of plywood. The body consists of a pair of side posts, a cross member and a base that gives rigidity. The work surface must be strong enough not to bend during grinding. The movable part of the table is hinged on the back side, and an adjusting screw on the front side. Depending on the screw thread pitch, it will be possible to adjust the grinding thickness.

Assembly

We hang an electric motor on the bottom of the case. A hole for the axle is provided in advance in the body. The drum is installed in the upper part of the frame. The axle is placed at both ends on bearings in cages, fixed with screws to the side supports.

We install the pulleys on the axle and stretch the belt drive. We equip electrical wiring, a switch. We place the adjusting screws: one at the bottom and a couple on the sides.

Drawings and models of homemade machines

We make a belt sander with our own hands

Device tape machine is as follows: a work table is installed on the tabletop in various positions. The table moves by means of rollers along cylindrical guides fixed on calipers. On the pulleys above the table, put on a sanding belt, which is tensioned with screws. The part is pressed with an iron to the abrasive, which moves in the transverse direction. The movement of the tape is provided by an electric motor through a belt drive.

You can make such a device yourself. The main elements of the machine: engine, base and rollers. The electric motor will again come from a washing machine (power up to 300 W, 1.5 thousand revolutions per minute). The base is cut out of metal and welded, it must be strong enough not to stagger. Dimensions worktop approximately 16 x 18 cm. At the end of one of the sides, 3 holes are drilled for mounting the platform with electric motors using bolts.

It is desirable to maximize the working area, this will increase the possibility of using the machine. It is more convenient to grind parts when the length of the table is greater than or equal to the length of the workpiece.

With a speed of movement of the abrasive belt of about 20 m / s, the diameter of the cylinders should be about 20 cm. With the right calculation, you can do without a gearbox.

The master cylinder is rigidly fixed to the engine pulley, the second - tension. It rotates freely on bearings on a fixed axle. On the side of the movable cylinder, the working surface should be slightly beveled in order to achieve a soft touch on the abrasive surface. This is very important for working with glued joints.

Cylinders can be made from chipboard. Square tiles 24 x 24 cm are cut out of which a package is assembled on the axis and turned to a diameter of 20 cm. When turning the drum, it is important to consider: in the middle its diameter should be 2.5 - 3 mm larger than at the edges.

This shape allows you to position the abrasive belt right in the middle. It is most convenient to use a tape 20 cm wide. In addition to grinding wood parts on such a machine, you can sharpen any cutters, as well as process curved parts.

The video demonstrates how to make a grinder with your own hands:

Every person who has had to deal with wood processing knows the importance of the final polishing of the finished product.

This also applies to holders for various agricultural implements, and wooden furniture, and building elements (doors, windows, window sills) and any other wood products. Sanding allows you to remove burrs, as well as bring smoothness and shine to the wood.

Of course, grinding work can be done with a regular piece of sandpaper or a special attachment for drills or angle grinders. But this takes a lot of time and does not ensure the ideal shape of the product. Therefore, for such purposes, various grinding machines were created.

Most often in living conditions and under conditions small scale production they use a drum grinding machine, the device, the principle of operation and the possibility of making it with our own hands, we will consider in this publication.

1 Drum grinder - device, principle of operation

The drum grinder got its name from the rotating cylinder - the drum, which, in fact, performs the function of grinding.

In addition to the grinding itself, which allows you to remove burrs and give the wooden surface a perfect smoothness, such devices also perform a calibration function. Drum grinder or any other type allows you to adjust wooden detail to the right size with millimeter precision.

This machine is used for finishing sanding and grading of flat and long wood products, such as wood panel surfaces, chipboard, fiberboard, etc., doors, window sills, and so on. The use of such a device for processing cylindrical parts is not possible.

1.1 Main components

The drum grinder has no fundamental differences from any other machines in terms of appearance and set of main components.

The basic package of such a device includes the following elements:

1. The bed is the part of any machine to which all other elements are attached.
2. The engine performs the function of driving the moving parts of the machine. Most often, drum sanders for wood are equipped with two motors. One rotates the drum itself according to the principle of a drill, the second sets the feed tape in motion.
3. Grinding planer drum, on which the emery belt is wound and attached. It is necessarily equipped with a tensioning mechanism, with the help of which, when the tape is heated, it is automatically tensioned. The rotating drum with sanding belt directly smoothes the woodwork.
4. Feed drum with conveyor belt. This part of the woodworking machine makes its own wiring wooden product on the grinding drum. Due to the flat surface of the conveyor and the same distance from the belt to the drum along its entire plane, the product is evenly adjusted to the desired dimensions.
5. The mechanism that regulates the speed of the conveyor belt.
6. Fixing racks of the grinding drum, equipped with a ruler. The ruler and screw fixation on the racks allow you to set the required thickness, under which the product must be adjusted.
7. The protective cover covers the grinding drum to prevent injury during operation.
8. Machine for removing dust and chips.

1.2 How it works

Such a grinding machine works on the principle of a drill. Its grinding part rotates the engine at high speed - an average of 2000 rpm.

The grinder can have different weights, different sizes, sanding drum length, conveyor belt length and width, maximum and minimum height drum settings, etc.

Choice technical parameters device depends on the features for which it was purchased.

After installing the machine, you need to calibrate the grinding drum to avoid eccentric rotation and unnecessary vibrations. In addition, a non-centered drum will not be able to clean the products evenly.

To do this, we take two beams of the same height, install them on the feed belt, lower the drum on them and fix them in this position. Next, set the height of the mechanism, depending on the size of the part to be ground.

We turn on the installation. For the first pass it is better to set the minimum speed of the feed belt, for the final - the maximum - 3 meters per minute.

The grinding drum should gain momentum, like a drill. After that we put wooden beam to be processed onto the conveyor belt. The passage of the beam under the drum occurs automatically.

We repeat this action right amount times, until our part comes into the desired shape and acquires the specified dimensions.

If the sides of the product have different size, the height of the drum must be adjusted for each change in parameters.

2 Types of machines

If we talk about grinding machines in general, their classification is based on two parameters: the scope and the functions performed.

According to the field of application, the machines are:

• circular grinding machines. Are intended for processing of the details having round section;
• surface grinding. Their task is to grind flat parts. The drum machine also belongs to this type;
• internal grinding. These mechanisms are used to process internal surfaces products. Drills are often used for this purpose;
• specialized. Designed for processing complex surfaces - threads, grooves, teeth, etc.

Various machines can perform different functions:

• pruning and cleaning;
• sharpening;
• grinding.

2.1 We make a drum machine with our own hands

It is difficult to make a drum grinder for raw wood with your own hands, but it is quite possible.

To do this, we take a list necessary elements and looking for suitable material and spare parts.

And so, we need:

1. Bed. For these purposes, any stable workbench or table is suitable, to which other elements of the machine can be screwed. It is better if the bed is metal. If you have to use a wooden structure, you need to strengthen it with your own hands.
2. Electric motor with a power of 200-300 watts. The speed should be 1500-2000 rpm. Better if it is single phase asynchronous motor. For these purposes, a mechanism from an old washing machine is suitable (in this case, we take pulleys with a belt from it), drills, grinders, etc.
3. Sanding drum for wood. This is perhaps the most important and most complex part of the machine, on which the quality of the work performed will depend. We will talk later about how and from what to make a home-made grinding drum with our own hands.
4. Drum stands. The device that fixes the drum and regulates its height can be made of wooden beams. The height adjustment mechanism can be made by hand in two versions. The first option is through holes on the racks through which the drum will be attached. This option is simpler, but it only allows you to work with a fixed adjustment step of about 1 cm. The second option is long screws mounted perpendicular to the drum. In this case, by tightening the screws, we will be able to raise the grinding device, releasing - to lower it. In the second variant, height adjustment is possible with an accuracy of up to a millimeter.

We will not make a conveyor belt with our own hands. It's possible, but not necessary. Feeding on homemade machines is usually done manually.

2.2 Making a drum

Before proceeding with the manufacture of the drum itself, you need to clearly understand what functions our machine will perform. The point is that what smaller size cylinder, the easier and faster it will be rotated by the engine from the drill.

To make a grinding drum, we need a piece of anything that has a cylindrical shape, the desired length and diameter. It can be a wooden beam with a round section, a PVC pipe, metal pipe and much more.

We will consider as a material pvc pipe for making a drum with your own hands.

1. We take the segment of plastic pipe that is required in size. We also need a metal pin that acts as an axis, wooden or plastic plugs that match in diameter with inside diameter pipes, screws, rubber, glue.
2. We take the plugs and make holes in them that correspond in diameter to the thickness of the rod.
3. Holes in the plugs must be exactly in the center. The slightest eccentricity of the drum will lead to incorrect operation of the machine.
4. We tightly plant the plugs into the pipe and fix it with self-tapping screws.
5. Insert the pin into the holes in the plugs. The axis should protrude from the cylinder by 2-3 cm on each side. It is she who will act as an attachment to the adjusting racks.
6. We glue rubber on the drum. To her it will be easier to attach the sanding belt.

2.3 Assembling the machine

To assemble the machine you need:

1. Install the racks on the frame.
2. Attach the drum to them so that the height of its rise can be adjusted.
3. Connect the motor to the drum using a belt or chain drive.
4. You can get to work.

2.4 Homemade drum sander (video)

All materials in any production, in addition to manufacturing, require additional and finishing processing. Vivid examples of such treatments are grinding and polishing of the product. These two types of mechanical action on the surface of the part bring its appearance to perfection. However, everyone knows that in order to perform these operations by hand, it will take a lot of time and effort, and only a very experienced master can ensure even processing. To facilitate this kind of work, a person came up with various devices and mechanisms to help himself. Some of them will be discussed further.

General purpose and types of machines

The machine is intended for the final processing of parts and workpieces made of different materials by exposing them to a surface with an abrasive or diamond coating. The machine, its constituent mechanisms and fixtures allow maintaining the accuracy of size and shape, and also ensure the creation of an ideal surface of a part or workpiece.

With the help of the machine, you can process flat parts, surfaces outside and inside, parts of various geometric shapes, grind or polish threads and gear teeth. According to their characteristics, grinding machines are divided into:

• Cylindrical grinding.
• Internal grinding.
• Centerless grinding.
• Surface grinding.
• Special machines (for grinding threads, gears).

Grinding process

Grinding is the process of removing the top layer from the surface of the workpiece using abrasives or diamond grit. They are assembled into a common mass on the working surface and fastened with a binder. They eventually form a grinding wheel or belt.

During operation, the abrasive surface is given a circular motion by means of an electric motor. When the surface of the workpiece comes into contact with the abrasive, the machining process takes place. There is a common belief that grinding with abrasives is friction processing. However, this is not true.

Each abrasive particle has sharp edges, when touched with a material (metal, plastic, wood, stone) it works like a cutting tool and removes chips, like a milling cutter or a drill. Given the considerable speed of rotation of the grinding wheels, as well as the occurrence of chips as a grinding product, it is necessary to take into account the possibility of injury by this very chip.

Safety measures during work

When working on the machine, the following safety precautions must be observed:

Necessity at work and at home

Today, in production shops, grinding machines are used all the time. Depending on the scale of production, both one machine and all its varieties in terms of complexity and dimensions can be installed.

However, there is always a use for this equipment in everyday life. Some - in the garage there is a bench sander for metal processing. Others have several wood sanders of different design installed in their workshop. The third - in possession is a universal, combined machine. There are power tools for manual grinding: drum type, belt sander, band saw, small machines or large machines. And they are all in demand.

There is a fairly wide range of all kinds of similar equipment from many manufacturers on the market. And their prices are quite reasonable. But these are general purpose machines. And if a person is engaged in his own business, or he has a hobby, then a machine of special specialization is needed. Here the price is already rising several times.

For this reason, or based on their own desires, many craftsmen make homemade products. Mainly for processing wood, plastic and metal, less often for cutting and grinding stone. And, in general, this is correct. After all, even a simple sharpening of kitchen knives is easier and faster to do on a machine than manually using a whetstone. The benefit of creating a home-made machine for wood with your own hands is also its very simple design.

It is not difficult to assemble a do-it-yourself grinding machine for wood. In the people it is also called simply - emery.

The main component is the engine. Surely many of the household there is an old washing machine. Its motor is quite suitable for this purpose. If not, a new engine on the market will be quite expensive, but at any flea market you can find a used one in working order. The electric motor must be strong from 750 W to 2 kW, not high-speed from 1500 to 3000 rpm, if it is three-phase, then it can always be adapted to 220 V. You will also need thick plywood, self-tapping screws, PVA glue, and a tool, of course.

The task is simple: to make a hard drive on which sandpaper is glued. To do this, we draw a circle with a diameter of 150-170 mm on plywood, if the plywood is thick enough to hide the clamping nut, one blank is enough. If not, we glue two identical blanks with PVA glue. The clamping nut of the motor spindle must be recessed into the disk flush with its working plane.

From the same plywood 15-24 mm, you need to make several parts:

• The frame to which the engine will be attached.
• Feed table with guides for changing the angle of inclination.
• The design of disk protection.
• Base for attaching the entire machine to the workbench.

Protection for the disk can be made in the form of an arch with right angles or truncated. She, like the feed table, is attached to the frame. Of the additional devices, you can install an emphasis-protractor on the feed table, which will allow you to feed the workpiece at a fixed, horizontal angle.

Paying tribute to aesthetics, it is desirable to grind every detail before assembly. But this is optional, but with the serving table this must be done carefully. A smooth surface will ensure uniform and continuous movement of the part along the working surface of the disk.

The purpose of this machine is revealed in its very name - surface grinding, that is, for grinding flat surfaces of parts and workpieces. It can be disk, drum (like a thickness gauge) or tape. At the same time, its working surface can be located vertically, horizontally or regulated.

Individual machine designs are made fully adjustable. But this is individual. Everyone makes home-made machines for themselves, so that it is more convenient to work. Fully adjustable designs are more difficult to manufacture. They have an adjustable pressure of the drum or tape, that is, in other words, there is the possibility of a fixed movement of the working surface along the vertical axis. And the tool rest has a mechanism of movement in two directions, like a cutter holder carriage on a lathe.

From the verbal description it is difficult to imagine what it looks like. And even more difficult to understand how it works. But today we have the Internet. There you can find videos where experienced craftsmen share their experience, explain in detail and show how to make such equipment. Detailed drawings and diagrams are provided with exact dimensions and instructions on what material to use for assembly. In general, if there are difficulties with self-design, then you can always just make someone else's copy.

This machine was invented for processing long parts. The abrasive belt is based on a durable cloth fabric fastened into a ring. There are different sizes. It is driven by the same electric motor with similar characteristics. But some craftsmen replace the engine with a drill. A good drill is a versatile tool in many ways. However, such a replacement is more relevant for the small size of desktop machines, as a rule, modelers use them.

How is a belt sander assembled with your own hands? The tape is stretched between two shafts or drum rollers. One of which is the master (it is attached to the motor spindle), and the second is the slave (it provides tension to the sanding belt). To prevent the tape from jumping off the drums, washers-stoppers are attached to their ends. It turns out something like a textile coil. With slight distortions, the wear of the belt occurs faster than the edges of the belt rubbing against the lock washers are destroyed. So this idea is quite viable and justifies itself.

Also, between the drums on the back side of the belt, a support screen is installed, which ensures tight pressing of the entire plane of the workpiece to the surface of the belt. To reduce the friction force, the screen is carefully polished. It can be made from both light metal and hard wood.

The drive roller must be rubberized or made of hard rubber. This will ensure that the tape does not slip on the surface of the roller. The entire structure, if necessary, can be positioned in different ways: vertically, horizontally or at an angle. To a common frame, as on all similar machines, a rigid handrest is attached, at an angle of 90 degrees, or adjustable. The distance between the tape and the edge of the hand table should not be more than 3 mm. Due to the fact that the rupture of the tape is not capable of causing significant bodily harm, protection is made only to remove grinding products.

Homemade grinder

A grinder is a high speed belt grinder or general purpose machine. Working surfaces - a disk and a tape. The engine used is the same as on all machines. And high speed is achieved by using pulleys of different diameters. A large diameter pulley is mounted on the motor spindle and is the driving one. Small pulley - tension.

On a universal machine, a disk is also attached to the spindle. You can also install an additional transfer roller, the support mounts of which will be spring-loaded. This is done to quickly change the abrasive belt.

The grinder differs from other grinders in processing speed and versatility. Using interchangeable belts for different materials, even high-alloy steel surfaces can be quickly processed.